Cold drawn film made of an ethylene polymer blend composition

Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...

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Details

525221, 525222, 525227, 525240, C08L 2316, C08L 2308, C08L 2306

Patent

active

043025579

ABSTRACT:
A composition for shrinkable film which excels in heat-sealability, transparency, strength, and particularly low-temperature quick shrinking property and, therefore, suits production chiefly of packaging materials, a film made of the composition and a process for the manufacture of the film are disclosed. Specifically, the composition comprises one of the specific combinations of components (A), (B) and (C), i.e. the combinations of (A)+(B), (B)+(C) and (A)+(B)+(C), wherein (A) is non-rigid polyolefine resins such as ethylene vinyl acetate, (B) is an elastomer comprising a specific ethylene-.alpha.-olefin copolymer, and (C) is rigid polyolefin resins such as polypropylene. The packaging film excelling particularly in optical property, mechanical strength and low-temperature shrinking property is obtained by converting a homogeneous blend of the aforementioned composition, either in its crosslinked form or in its non-crosslinked form, into a tubular raw film, which is stretched at a temperature low enough for imparting a high orientation to the film. The process for the manufacture of this packaging film is also disclosed.

REFERENCES:
patent: 3176052 (1965-03-01), Peticolas
patent: 3261889 (1966-07-01), Van't Wout
patent: 3361850 (1968-01-01), Young
patent: 3399250 (1968-08-01), Kirk et al.
patent: 3422055 (1969-01-01), Maloney
patent: 3549727 (1970-12-01), Coates et al.
patent: 3700753 (1972-10-01), Terada et al.
patent: 3821333 (1974-06-01), Goodwin
patent: 4123417 (1978-10-01), Finberg

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